This creates spots of zinc oxide on the strip, which can then be contacted by the ‘cat’s whisker’ contact. In the circuit, the clock is created by the 4 MHz crystal and a 10 kOhm ...

In addition to using the Whisker Litter-Robot 4 since 2022, I have also tested eight other boxes for our guide to the best self-cleaning litter boxes. For weeks, I took notes as my cats circled ...